rate manipulation involves more than a dozen major financial institutions including barclays, bank of america, and societe generale. >> susie: uncle sam may soon be exiting the auto business. the treasury department said today it will sell its remaining and controversial stake in general motors, in the next 15 months. as part of the deal, g-m will buy back $5.5 billion in shares, and that will happen by the end of this year. g.m. stock revved higher on the news, climbing 7% to $27 a share. and, as suzanne pratt reports, some investors like the sound of an independent g.m. >> reporter: it looks like general motors may soon be hitting the road all by itself. four years after spending nearly $50 billion to rescue the struggling automaker, the u.s. treasury wants out. and, gm needed to shake off the stigma of being known as government motors. >> general motors to wanted do this. they wanted to get the government off its back so to speak and to prove to the people they can pay back the loan, part of the loan. >> reporter: other auto experts says everyone involved wanted to end this year on a posit